Best available copv



H. H. WESTINGHOUSE.

AIR COMPRESSOR.

Armcmon rufo Nov. 3. 191s.

l 1 96,95 5 Patented Aug. 29, 1916,.

Illllk Y WITNESSES HENRY' HERMAN WESTINGHQUSE, or NEW YORK, N Y

AIR-CioniPnEsson.

`specification of LetcrsPatent.

meentedniig. 29, 191e,

Applieation filed November', 11313. Serizjil No. 798,861.

Q 'invention 'relates te air compressors ii'ing inecliunismfor. the sume, one ie -objects being te provide an improved rung n'ieclri-nism hui/'ing a reeipmcatinif, ill-ating, U11-other tn-and-fro movement :mi both sides of :in intermediate 0r eentral' position, in whichthe' pump piston is ut the 4extreme inner end' of lits stroke, hereljiy the movement of the mechanism in either 'direction vfrom said position causes 20 the pump piston ..`to malief` an outward strek-e, :15nd lshe-.freturnmovement of the' mechanism foi-ees' thepist-Qn back toits inner pesiiii'on. i. .L'iiother Objfect isto'govern'the pressure i. i' 'tliis diameter by .varying'the length of the strelie lof'the pump piston outward freinsuid extreme inner positionilund Still 'iuufher object ist() utilize the vertical Vi perl5/ing" drawinfrs': Figure 1 ie eievatio'n illustrating my feiplied -te--a jinetor rriiele; i ,hi'irizhontzjil section nl :in nir mi. n' 'l "ng, my improvement; IFig.

515i Fig. 2; Fig. l, :L d'iugrami .w showing :i.continuously.operetng zireentric fertile driving mechanism, mil governing, device'emitmlled by' the 45 'pump l1i,ri'fssure' ffm' shifting the' eccentric. te Yury-.the length 'of the stroke of the pump pis-Lexi, seme of the parts being shown in tien; and, Figs-3, a transverse view, dif'-A fervnt {imtiens nf 'the eccentric being indigymhdin dotted lines. l

' :rfiiug tothe 'construction shown, the "'cemp or comprises the Cylinder, 7, sie suction and discharge vulves, 55 wniiited in the cylinder head. :ind preferir?, substantially ush with the in- F, ner fece'tliereo as te prac-t illy eliminate all clearance space, Pisten, rod, .11,

. ens of a ehiele for actuating the re-. ting or oscillating ,driving mecha! :is-a shock absorberfer the ve 'Gon taken 'substentialiy 'en and crank 0reccentric,v 12,'.gin0unted Yn shaft, '13,' having bearings'inf the'wa-l-ls 'of the Crank Casing, 'kiff-Any suitable driving 60 mecha-mism' havinga reciprocating. Orreseilluting movementv to .and fre muy 'he' employed, that 'shown 'comprising .si )pinionv gear, 1,5, mounted ontheeifank. shaft, and "meshing with -the segment gear, 16,hn'i'ing'15 a shaft, 17, and zietneting'dislc' orfa'rni, 18, which muy 'be seillated by any' 'desired means. The driving mechanism thus'lnis :i ninvemen in yppos'ite'directions, uponboth sides of an intermediater'n central position' 70 in which the pump piston4 is the extreme ,inner end 0f its stroke, 'as shown inthe.y

drawing, 'whereby the 'movement in' eithen direction xnisesthe pump Ypiston to nieve outward a. .longer or shorterfdistunce zindv then bnc-k to its inner position. Astbe ztc'tiiating erm, 1S, is oscill'utedi, "itfmoves'thef segmental gear, 16, and causes th e 'pinion, 15, and Shaft, 19,tlo'l t'rn altehiit'ely in op" posite directions, thereby'reprocrting the 80 'pump piston. Y For theA 'purpose of'los'cillntingthedisl( or arm, 18,1111 eccentrie,f20, erinnerted by i rod., 19, tdsaid arm, idd mounted-on neen" tinuously 'runningj shelf@ 21,n`inybe e'ml85 ployed. In. Order -tqfgovern the 'pump cording tothe pressure,tliefeceentric, '20, muy be provided -with`a 'Slnt, 28,:rnd shifting means, -sueh 'eguctiug 'cnmfor I wedge members, 22 'ndn fthe-.lutterbeirig v90 adjustable ,longitudinally ofl th" [shaft by luid pressure device, suchl iis cylinder@ 24, pist-0n, L5,v stem," 27,'iand adjustable' spring,

^ With'sucli u. construction-lit 'will vbe Seen 95 that when thepressure. lc' w,-tlie eccentric,

20, occupies `a positioni'itlrthe shaftnt the (mier end' ef the slot, ii'heiebyfthe throw et! tbe eccentric is -nm'X-imum, l'en dftl'ie lum'p piston makes Aitsl longest `stxolce.l As: the/10G pump pressure"` is increased, the eccentric. shifted to bring its'ce'nter toward lthe 'cen'- ter of 'the "drivingshaft, tluirelij/Vv reduc-ing the errentrieity und :ilsothe lengt-h of stroke of the pump piston." In this way-theli'zngth 105;

tinuously and 'the' 'pressure thus C-on- 1.10

tmled. It will be nativ-ed that in gew.

' the pump by varying the length of of the piston in this1 manner. the. is changed at its outer end only, the

' vIt will now be seen thatl have provided constant minimum piston always returning to its extreme inner position al ost in contact with the face of the cylinder head,` whereby there is: substantially no clearance and all of `the air displaced-by the piston .will be forced'into the reservoir regardless lof the length of stroke. This is an important feature as it greatly increases the eliciency of the pump.,

`In Fig. 1, I have shown the mounted on the frame, y cle, over the spring, 32, with thevreciprocating bar, 19, attached to the axle, 33, for oscillating the arm, 18, by the vertical vibratory movements of the body ofthe vehicle upon its springs. In the normal position of the vehicle springs, the arm, 18, of the driving mechanism occupies its intermediate position with the pump piston at the inner end of its strokeso that any vertical vibration of the vehicle bodyA causes the driving mechanism ,to actuate the piston as before described, and compress air into thereservoir,

air compressor l 31. It also serves as a shockabsorber for the vehicle.

' As shown in the diagrammatic view, Fig.

4, the pump appears inside' elevation, while the driving eccentric and pressure goyernving means are indicated in longitudinal section for the purpose of showing the position of ,the eccentric relative tothe crankdisk, 18, of ythe pump, it being-understood, however, that in practice,.the eccentric, 20, and crank disk, 18, are usually in parallel planes, as indicated in Fig. 5. l/Vith the movement of the eccentricto its highest position, as shown in- Figs, 4, and 5,- the segment gear, 1G, is turned to its' eXtreme upper position with the piston at the outer end of its stroke, `and as the eccentric rotates through the different positions, kas indicated in dotted lines in Fig. .5, the crank disk, 18, is oscillated, and produces the reciprocating movement of the piston in the cylinder, thereby compressing air into the reservoir, 31.. 'Y

a compressor having a. variable stroke gov.- erned bythe fluid pressure, but having a clearance whereby the efliciency is greatly increased.

Havingl now described my invention, what I claim as new Patent is: v

1. In an air compressor, the 'combination with a cylinder, piston and crank shaft, of

a reciprocating driving mechanism having an intermediate position ,with the piston at .the inner end of its stroke, and a movement upon-bothsides of said intermediate position for turning ,said shaft alternately in opposite directions.

2.,In angair compressor, the combination with'a cyli'n'derl and pistonfof a segmental and desire to secure by Letters vin 'opposite directions.

4. In an air compressor, the combination with a cylinder, piston and crank shaft, of a reciprocating driving mechanism having an intermediate position with,the piston at the inner end of its stroke, and a movement upon both sides of said intermediate position for turning said lshaft alternately in opposite directions, and means for `varying the length of the stroke ofthe driving mechanism. y. i

5. In an air compressor, the combination with a cylinder, piston and crank shaft, of a reciprocating driving mechanism having an intermediate position with the piston at the inner end of upon both sides tion for turning opposite directions, and meansgoverned by the pump pressure for varying the length of strokeof the driving mechanism.

6. In an air compressor, the f-"combination with a cylinder, piston and crankshaft.l of a reciprocating driving mechanism having an intermediate position with thepiston'at the inner end of its stroke, upon both sides of4 said intermediate position for turning said shaft alternately in opposite directions, said meclianism ineluding a continuously rotating pcce'ntric, and means for shifting said eccentric to vary the length oftits stroke. i

Y-'7.. In an air compressor, the combination .with a cylinder, piston and crank shaft, of afreciprdcating driving mechanism having anfintermediate position with .the piston fat the` inner end of its stroke, and a lnovement upfofri both sides I tion for turning said.

its stroke, and a movement x of .said intermediate` posisaid shaft alternately in and a movement ofsaid intermediate posi-`- shaft alternately-1n oppos1te directlons. said-mechanism includ-'- 

